It is based on non-yet released 8.5 version of Tcl.
Port is almost fully-functional with one notable exception - there is no support for running external programs from Tcl script - i.e. exec command and open "|command" do not work.
It is possible to implement most of exec functionality (except background execution and event-driven pipes) under DOS, but I haven't yet found time to do it.
Port includes Waterloo TCP library, so socket command does work if you have suitable packet driver on your system.
Dynamic loading should work because DJGPP 2.05 implements dlopen function, but is not tested much.
Ck interfaces do not support mouse. It is limitation of PDCurses toolkit.
Sources of Ck toolkit are available on this site.